34 Cincinnati Society of Natural History. 



Those between the middle and anterior lateral lobes are scarce- 

 ly 2 mm. in length, and those between the anterior lateral 

 lobes and the lateral extension of the frontal lobe are scarcely 

 more than a millimeter long. The base of the outline border- 

 ing the eye, as far as can be determined from a free cheek, 

 is 2.2 mm. in length. No raised marginal border is present 

 on this free cheek. 



Axial lobe of the pygidium distinctly outlined by a narrow, 

 shallow furrow ; marked by seven annulations of which only 

 the first three or four are distinct across the entire width of 

 the lobe, while the remainder are successively more indistinct 

 along the median parts of the lobe. Lateral lobes of the pygi- 

 dium without indications of the pleurae, moderately deflected 

 about 2 mm. from the margin. 



Geological position : Near the top of the Crab Orchard 

 clay shales, at several localities along the road between Poplar 

 Flats and Martin's store, also opposite the home of W. A. 

 McEldowney, at Valley, and elsewhere in Lewis county, Ky. 



Calymene niagarensis. Hall. 

 West Union bed, at the blufif northwest of Martins, also 

 at Harin Hill, at the same horizon, in Lewis county, Kentucky. 



HOMOLANOTUS DELPHINOCEPHALUS, GrCCll. 

 Plate II, Figs. 19 A, B, C. 



The pygidium of Hoinolanotus delphinocephalus is char- 

 acterized by its acute posterior termination ; by the presence 

 of 11 to 13 axial annulations, of which the last three or four 

 are likely to be indistinct ; by seven distinct and one or two 

 indistinct pleural segments ; and by subtriangular, papulose 

 granules. The nuchal furrow of the cephalon is very faint, 

 and the glabella usually is rather indistinctly defined from the 

 remainder of the cephalon, being but slightly elevated above 

 the general convexity. 



In our specimens, the cast of the inner surface of the 

 cephalon shows a narrow and sharply defined nuchal furrow, 

 bent slightly forward at the middle. The lateral borders of 



34 



